A couple days ago, I was noticing that the tracking was getting a bit spotty.
I then noticed that I had my calibration points set at 9.
I usually have it at the maximum points, but during some time, it was reset.
It's possible that the tracking recovery is coincidental, and 9 points is usually adequate.
I wonder what would happen if you could use more points, but I'm guessing that there are diminishing returns.